A train has this kind of ‘motive’

adverb or adjective

1. In the register as written

noun

1. Any of several leguminous plants (genera Astragalus and Oxytropis) of western North America that contain a toxin that causes locoism especially in livestock when ingested in large quantities locoweed

verb

1. To poison with locoweed
2. To make frenzied

adjective

1. Mentally disordered frenzied

adverb

1. In the place of a parent

   "school officials acting in loco parentis"

noun

1. Regulation or supervision by an administrative body (as at a university) acting in loco parentis

Latin phrase

1. It is pleasant to be frivolous at the appropriate time

Latin phrase

1. In its proper place